SOLUTION: how to tell when is the number a closed dot or open dot

SOLUTION: how to tell when is the number a closed dot or open dot

Algebra.Com

Question 359482: how to tell when is the number a closed dot or open dot
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Closed dot means that point is part of the solution.
So when would look like,

.
.
.
Open dot means that the point is not part of the solution but represents a boundary.
So when would look like,

.
.
.
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